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I Can proton mass be measured without assuming inertia?

  1. Jul 15, 2017 #1
    Direct gravitational measurements of subatomic particles seems impossible. Has it been done/tried? The mass of the proton as I know it is always "indirectly" determined by (for example) bending a beam of charged protons in a magnetic field.
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  3. Jul 15, 2017 #2

    Vanadium 50

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    It's been done with neutrons.

    But what's wrong with using a box of hydrogen?
  4. Jul 16, 2017 #3


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    Could that be because you can gather a large number of neutrons together without them scattering in all directions before you can measure them?
    Hydrogen - yes, why not? Or any other atom, for that matter.
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